Summary of points to note about license plates

具体步骤1、将采集到的彩色车牌图像转换成灰度图2、灰度化的图像利用高斯平滑处理后，再对其进行中直滤波3、使用Sobel算子对图像进行边缘检测4、对二值化的图像进行腐蚀，膨胀，开运算，闭运算的形态学组合变换5、对形态学变换后的图像进行轮廓查找，根据车牌的长宽比提取车牌代码实现图像灰度化gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)高斯平滑，中值滤波处理gaussian = cv2.GaussianBlur(gray, (3, 3), 0, 0, cv2.BORDER_DEFAULT) median = cv2.medianBlur(gaussian, 5)Sobel边缘检测sobel

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简介：具体步骤1、将采集到的彩色车牌图像转换成灰度图2、灰度化的图像利用高斯平滑处理后，再对其进行中直滤波3、使用Sobel算子对图像进行边缘检测4、对二值化的图像进行腐蚀，膨胀，开运算，闭运算的形态学组合变换5、对形态学变换后的图像进行轮廓查找，根据车牌的长宽比提取车牌<!more>代码实现图像灰度化gray=cv2.cvtColor(img,cv2.COLORBGR2GR...

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Introduction: The database is informix, the encoding is iso-8859-1, and the php encoding is gbk. I tried various ways to convert it online, but nothing worked. The code is as follows, where $licenseno is the license plate number, and the province abbreviation in the middle is a Chinese character. ``` $sql.="and b.licenseno = "".$licenseno."""; ``` will return the following error: ``` Warning: odbc_exec() [function.odbc-exec]: SQL error: [Informix][In

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